Repo tidy: logs consolidated, 15/16 scripts tracked, docs synced (#615/#611/#603)

Run outputs moved to logs/ (incl. sda partition-table backup). New from
the 15:57-16:03 parallel session: 16-grow-root-online.sh (RAN: / = 431G
online, swap removed by design — GROW-ROOT-RUNBOOK superseded) and
15-docker-to-data2.sh (staged, not run). README/NEXT/RUNBOOK/REBUILD
reflect current reality. Moot rdp-testprep timer removed from the VM.

Details: https://projects.knownelement.com/issues/615

logs/6-remove-agent-stacks.out

@@ -0,0 +1,19 @@
+== remove agent stacks 2026-08-31T21:58:26-05:00 ==
+Removed '/etc/systemd/system/timers.target.wants/tsg-supervisor.timer'.
+Removed '/etc/systemd/system/multi-user.target.wants/reachableceo-agent-stack.service'.
+removed unit: tsg-supervisor.timer
+removed unit: tsg-supervisor.service
+removed unit: tsg-agent-stacks.service
+removed unit: reachableceo-agent-stack.service
+moved launcher: /usr/local/sbin/launch-rceo-stack.sh
+moved launcher: /usr/local/sbin/setup-rceo-stack.sh
+No screen session found.
+root screen ukrrs-gateway-final: not present
+-- cron cross-check (expect clean) --
+root crontab: clean
+cron dirs: clean
+-- verify: units gone, timer list, remaining screens --
+no stack/supervisor units remain
+No Sockets found in /run/screen/S-root.
+
+== done 2026-08-31T21:58:29-05:00 — rollback: restore /home/reachableceo/projects/ultix/removed-agent-stacks + re-enable units ==